Wolves fans have reportedly been attacked ahead of their Europa League clash with Braga.
Nuno Espirito Santo's side take on the Portuguese side on Thursday night with around 6,000 fans making the trip.
The majority of those supporters are believed to have flown into Porto before making the trip to Braga.
Birmingham Mail reports Wolves fans were attacked ahead of the match by hooligans from Standard Liege.
The Belgian side are also in Europa League action on Thursday night, taking on Vitoria in their latest group stage match.
At least one Wolves fan is believed to have been taken to hospital due to his injuries.
Footage has also emerged of police clashing with a large group outside a restaurant, fending them off with rubber bullets.
Fans had feared of a potential clash with the multiple different sets of supporters making the trip to Portugal.
One fan tweeted: "150 Liege fans all in black just round the corner from where all the Wolves fans are down by the river. This is not going to end well."
Meanwhile, boss Nuno has refused to address speculation linking him with the Arsenal job.
The Wolves chief has emerged as the favourite to replace under-fire Unai Emery at the Emirates.
"You know me well enough. You know I'm not going to answer about that and mention an issue that is not a reality,
"We're doing OK. There is a lot of room to improve as a group as a team. This is what we want to do, all together."
Wolves, who are currently second in Group K, take on leaders Braga in Portugal on Thursday. A win will see the Midlands team progress to the knockout stages.
